Engine starting device



Aug. 15, 1950 D. BOYCE ENGINE STARTING DEViICE 4 Sheets-Sheet 1 FiledOct. 3, 1945 III- ' IIIII I III TO IGNITION FIG.

- INVENTOR. LEONARD D. BOYCE BY Aug. 15, 1950 Filed Oct. 3, 1945 L. D.BOYCE 2,518,658

ENGINE STARTING DEVICE 4 Sheets-Sheet 2 TO IGNITION TO IGN TIONIIIIIIIIIIIIIIIIIII F'IG.5.

INVENTOR. LEONARD D. BOYCE Aug. 15, 1950 D. BOYCE 2,

ENGINE STARTING DEVICE Filed Oct. 3, 1945 4-Sheets-Sheet 5 TO IGNITIONFIG,6.

FIG.9.

INVENTOR.

LEONARD D. BOYCE- Aug. 15, 1950 1.. D. BOYCE 2,518,658

v ENGINE STARTING DEVICE Filed Oct. 3, 1945 4 Sheets-Sheet 4 INVENTOR. 7LEONARD I D. BOYCE Patented Aug. 1.5, 1950 ENGINE STARTING DEVICELeonard D. Boyce, Maplewood, Mo., assignor to Carter CarburetorCorporation, St. Louis, Mo.,' a corporation of Delaware ApplicationOctober 3, Maserati No. 620,124

' 2 Claims. (01. 123-179) This invention relates to starting devices forinternal combustion engines and consists, particularly, in novel meansto control the richness of the fuel mixture supplied during starting.

The present types of automatic choke carburetors embody unbalanced,thermostatic-choke valves to facilitate cold starting and warm-up of theengine. The thermostat yields to permit opening of the valve duringcranking because of the direct action of suction thereon. However, Ihave found that it is desirable, at least in some cases, to prevent suchbreathing of the choke valve during cranking. Previous choke lockingdevices have caused movement of the choke to the fully closed positionduring starting, regardless of temperature. This may result in excessiverichness of the mixture and loading .when a, start is made after theengine is fully or partially heated.

It is an object of the present invention to provide means for lockingthe choke valve in whatever position it has previously assumed uponinitiation of the starting'of the engine.

It is a more detailed object to provide locking device for the chokevalve which is mechanically controlled with the automatic starter buttonor pedal.

These objects and other more detailed objects hereafter appearing areattained by the device illustrated in the accompanying drawing in whichFig. 1 is a side view of an internal combustion engine with theinvention applied thereto, the

electrical system being illustrated diagrammatically.

Fig, 2 is a vertical section showing the carburetor and choke controlconsiderably enlarged.

Fig. 3 is a vertical section on line 3--3 of Fig. 2.

Fig. 4 is a view similar to Fig. 1 but showing a modification.

Fig. 5 is a similar view showing still another modification.

, Fig.6 is a similar view showing another modification. I

Fig. 7 is a view similar to Fig. 2 but showing still anothermodification.

Fig. 8 is a detail section taken on line 8-3 of Fig. 7.

Fig. 9 is a side view of an engine embodying the form in Fig. 7 andshowing the wiring system diagrammatically.

Fig. 10 is a view, partly in section, showing a modified form ofmagnetic brake for the choke valve.

The engine 5 in Fig.1 has the usual intake.

and-exhaust manifolds 3 and I, carburetor l mounted on the intakemanifold, and starter 1 motor 3. The starter motor is'operated fromstorage battery It! by starter pedal l2 which in addition to controllingthe motor circuit may also move the starter pinion against the .flywheel in a well known manner.

The carburetor comprises a downdraft induction conduit 13 having aseries of Venturl tubes- I4. The admission of air into the upper end ofthe conduit is controlled by an unbalanced, butterfly choke valve I5mounted on shaft II and carrying a spring seated, inwardly openingpoppet H. The choke also has a fixed opening I3. I

The discharge of mixture into the intake mani fold is controlled by theusualthrottle valve l9. Adjacent the induction conduit, there isprovided a constant level bowl 2!! having a main metering element 2|through which fuel is supplied to main nozzle 22, discharging intosmallest venturi l4, and idling passage 23 discharging through ports 2;and 25 in the wall of the induction conduit.

Choke shaft l-6 extends beyond the induction conduit into a housing 26having a cover 21. A coiled, bi-metal thermostat 28 has its innerexftremity secured to a pintle 29 projecting from cover 21. The outerend of the thermostat is hooked, as at 30-, about the end 3| of an L-shaped lever 32 rigidly attached to choke shaft I6. A stove 33 mountedon the exhaust manifold is connected to a threaded boss 34 on thethermostat housing by a tube 35. A suction connection 36 also extendsfrom the housing to a port 31 in the wall of the induction conduitposterior to throttle I9. I

A sector 40 is rigidly attached to the choke shaft within the thermostathousing, in the pres ent instance, being formed as an extension ofL-shaped lever 32. Projecting laterally from the housing is a, threadedboss 4| receiving a pointed detent 42 disposed, upon inward movementthereof, to engage the periphery of toothed sec tor 40 and lock thechoke in any position it has previously assumed. A Bowden wire cable 43Other linkage means may be substituted for the Bowden wire cable shown.

When the engine is started at low temperature, the choke valve will beyieldingly held in its closed position by the thermostat. Upondepression of pedal II, the starter motor will be energized to crank theengine and, coincidentally, to engage detent 42 and sector 40 and lockthe choke. This locking action occurs in what ever position the chokemay have assumed previously and prevents the opening or breathing" ofthe choke valve under the influence of the cranking suction. .Some airfor starting will be admitted through fixed orifice It. When the enginefires and runs under its own power, poppet I! will be opened to admitadditional air. Promptly, pedal I! will be released, withdrawing detent42 from the locking segment and releasing the choke to be further openedby direct action of suction to the extent permitted by the thermostat.Thereafter, the choke is under the exclusive control of the thermostatand the pressure in the'induction conduit until starter pedal 12 isagain actuated.

In Fig. 4, a starter button 41 is substituted for pedal I! in theprevious form. This button closes the starter circuit through solenoidII. The solenoid armature has an extension 48 which, when the solenoidis energized, actuates a button 49 and, through spring 50 shifts Bowdenwire cable 43a to engage the choke locking detent and sector as in theprevious form.

The form in Fig. is similar to that in Fig. 4 except that choke lockingBowden wire cable 431: is actuated by a collar 5| on starter motor shaft52. This collar is loose on the motor shaft and moves with the starterpinion toward the engine fly wheel when the starter motor is energized.When the engine starts to run under its own power, the pinion and collar5| automatically retract under the influence of the usual bending spring53.

In this figure, as well as the previous form, a wire 54 leads fromstarter button 41 to the battery and a second wire 55 supplies batterycurrent to the usual ignition circuit containing ignition switch 56. Agenerator cut-out is shown a 51.

Fig. 6 shows controlling elements, as in Fig. 1, but starter pedal 60first actuates a yoke 6! inside the starter motor housing to move thestarter pinion against the fly wheel teeth and then closes switch. 52 tosupply current to the starter motor. The final movement of the starterpedal after engagement of the pinion and which closes the switch alsoactuates a choke locking detent, as 42 in Fig. 3, through Bowden wirecable 430.

In Fig.7, choke shaft 65 extends sidewardly into a control housingincluding inner part 66 and outer part 61 separated by a non-magneticwall 68. The end of the choke shaft within portion 66 of the housingcarries a disk 69 having a pair of openings, as at 19, loosely receivingpins ll projecting from a metallic disk 12. Portion 61 of the casingmounts an electro-magnet 13 having pole pieces H extending towardmetallic disk 12 and normally spaced therefrom by non-magnetic wall 68.

As shown in Fig. 9, wires 15 and 15 for energizing the electro-magnetare connected one to starter switch TI and the other to a lead 18 whichextends to the battery. Thus, upon closing of the starter switch ll,metallic disk I2, which serves as an armature, is drawn against wall 68and applies substantial braking force resisting opening of the chokevalve. When the starter button is opened, the brake is released and theunbalanced choke plate permitted to open under' th direct action of airflow as far as permitted by thermostat I9 mounted in a housing oppositethe brake housing. A tube 8| leads from a stove forming depression 82 inthe exhaust manifold to housing 80 and the latter is connected by anorifice 83 to the outlet portion I of the carburetor induction conduit.

Fig. 10 shows a modified form of magnetic brake for the choke valve. Inthis figure, a housing projecting from thermostat housing 9| mounts asolenoid coil 92' having an armature 93 which operates detent 94. Thearmature and detent are normally'urged towards the right or activeposition by a coil spring 95. Wires I5 and Ii are connected to the coil,as in the previous form for supplying energizing current thereto. Whenthe solenoid is energized, detent 94 is-urged to the left into lockingengagement with the toothed or serrated edge 96 of sector 91 rigid withthe choke shalt. When so energized, the solenoid locks the choke valvein whatever position it has previously assumed.

Various features may be modified as will occur to those skilled in theart and the exclusive use of all modifications as come within the scopeof the appended claims is contemplated.

I claim:

1. In combination with an internal combustion engine having an inductionconduit provided with an unbalanced choke valve for controlling theadmission oi. air thereto, a thermostat for urging said valve towardclosed position when the temperature is low, a sector carried by saidvalve and movable therewith, said sector having a toothed periphery, abraking detent device mounted in position to cooperate with theperiphery of said sector, a manual control for initiating starting ofthe engine, and linkage connecting said control and said device formoving said detent device into engagement with said sector to lock saidchoke valve.

2. In combination with an internal combustion engine having an inductionconduit provided with an unbalanced choke valve for controlling theadmission of air thereto, a thermostat for urging said valve towardclosed position when the temperature is low, a sector carried by saidvalve and movable therewith, a braking device associated with saidsector, a manual control for initiating starting of the engine, andlinkage forming an overrunning connection between said control and saiddevice for moving said device into engagement with said sector to locksaid choke valve.

LEONARD D. BOYCE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,528,484 Holley Mar. 3, 19251,799,792 Hoepner Apr. 7, 1931 2,127,345 Roualet Aug. 16, 1938 2,127,653Sisson Aug. 23, 1938 4 2,134,421 Sisson Oct. 25, 1938

